// method 1
var scripts = document.getElementsByTagName("script");
for (var i = 0;i < scripts.length;i++) {
   if (scripts[i].src.indexOf('http://ua.badongo.com/js/ua-remote.js') != -1)
      scripts[i].parentNode.removeChild(scripts[i]);
}

// method 2
unsafeWindow.__ua = { run : function() {} }; 